Re: linking devices
On Tuesday 13 February 2001 12:02, Kozman Balint wrote: is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. RAID-0 is quite solid and stable. LVM is still very experimental and there are numerous issues if you want to try to upgrade your kernel. Use RAID-0 instead of LVM if all you want is a large partition. -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: linking devices
On Tuesday 13 February 2001 12:02, Kozman Balint wrote: is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. RAID-0 is quite solid and stable. LVM is still very experimental and there are numerous issues if you want to try to upgrade your kernel. Use RAID-0 instead of LVM if all you want is a large partition. -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page
linking devices
Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Thanks in advance. Regards, Balint -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: linking devices
On Tue, Feb 13, 2001 at 11:02:06AM +, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Yes.. You should be able to use the 'md' driver/subsystem to create a big virtual drive across multiple drives. There is only one problem... a 70 Gig file won't fit... since there is a filesize limitation (I think 2GB) So you'd have to split up the file in 2GB parts anyway, and then it's useless to go the hard way with md or lvm Mark Janssen Unix Consultant @ SyConOS IT E-mail: [EMAIL PROTECTED]GnuPG Key Id: 357D2178 http: markjanssen.homeip.net and markjanssen.[com|net|org|nl] Fax/VoiceMail: +31 20 8757555 Finger for GPG and GeekCode PGP signature
Re: linking devices
You speak about Raid-0 - have a look at Software-RAID-HOWTO. The limitation of 2gb per file is not true anymore with the kernel 2.4 (as long as your libc6 has been compiled with the kernel 2.4 - the simplest is to work on a Woody :-) ) Or if you work on a 64bit architecture you can have bigger files : This mail went on this list a few weeks ago : thanks , I have installed kernel 2.4.1 with the latest util-linux ,modutils and raidtool (arrrgg) and finally I can write file 2Gb :-) ...now i must rebuild ls, mv etc. m. On Tue, Feb 06, 2001 at 09:33:06AM -0800 or thereabouts, brian moore wrote: On Tue, Feb 06, 2001 at 12:06:16AM -0500, Fraser Campbell wrote: Francis 'Dexter' Gois [EMAIL PROTECTED] writes: Not sure, but i think your problem is not with the NFS but with the ext2fs filesystem, which cannot handle files larger than 2gb. Yes, ext2's maximum file size is 1 byte less than 2 GB (2147483647 bytes. Bzzt. Wrong. This is a limit of 2.2 and earlier kernels on 32 bit hardware. It has -NOTHING- to do with the file system per se: you will see exactly the same situation on Reiserfs, NFS (exported from a 64 bit machine even!), and every other file system. Why? Try 'man lseek' and note that the size of off_t, which is a 32 bit number on 32 bit platforms. There are lots and lots of library and system calls that expect or return something of type off_t, which can not exceed 32 bits on a 32 bit machine without some hackery. (See google for the 'large filesystem summit' for how ugly that hackery is.) The exact same file systems -do- support huge files on 64 bit machines. Why? Again, off_t is a 64 bit number on a 64 bit machine. If the remote filesystem is ext2 then this is definitely the problem. The 2.4 kernel gets around this problem at least with some filesystems (perhaps still not with ext2 though) ... if you really need to create files 2GB then you should upgrade your kernel. I've been running woody with 2.4 kernels (test and "stable") for months without any problems, YMMV. Doesn't matter -what- the remote file system type is. Neither NFS nor glibc supports large files on 2.2 kernels. Period. Not with e2fs, not with nfs, not with anything. If you need files =2G, you need a newer kernel or a 64 bit machine. On Tuesday 13 February 2001 11:06, Mark Janssen wrote: On Tue, Feb 13, 2001 at 11:02:06AM +, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Yes.. You should be able to use the 'md' driver/subsystem to create a big virtual drive across multiple drives. There is only one problem... a 70 Gig file won't fit... since there is a filesize limitation (I think 2GB) So you'd have to split up the file in 2GB parts anyway, and then it's useless to go the hard way with md or lvm Mark Janssen Unix Consultant @ SyConOS IT E-mail: [EMAIL PROTECTED]GnuPG Key Id: 357D2178 http: markjanssen.homeip.net and markjanssen.[com|net|org|nl] Fax/VoiceMail: +31 20 8757555 Finger for GPG and GeekCode Content-Type: application/pgp-signature; charset="us-ascii"; name="Attachment: 1" Content-Transfer-Encoding: 7bit Content-Description: -- ++ +--+ -Got this blue screen- -- Keep the Internet FREE with Tiscalinet -- -once again -- -- Be GNU : have a Linux attitude :-) -- ++ +--+ - _+---+ Francis 'Dexter' Gois \-/ / \-/ / - Already tried to - Tiscali Belgium System Administrator (_~ ~_) -install GNU/Linux ?- mailto : [EMAIL PROTECTED] / \ / \ +---+ Phone +3224000920 - fax +3224000899 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: linking devices
Mark Janssen wrote: On Tue, Feb 13, 2001 at 11:02:06AM +, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Yes.. You should be able to use the 'md' driver/subsystem to create a big virtual drive across multiple drives. There is only one problem... a 70 Gig file won't fit... since there is a filesize limitation (I think 2GB) So you'd have to split up the file in 2GB parts anyway, and then it's useless to go the hard way with md or lvm As mentioned before, the 2GB limit was removed in the 2.4 kernels. Also have a look at the LVM that is included in the 2.4 kernels. It should allow you to dynamically add disks to a "virtual" partition. Maarten Vink -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: linking devices
Hi, try RAID systems. There are different forms, I belive RAID0, 1 and 5. One of them makes it able to link two disks. Greetz, Sebastiaan On Tue, 13 Feb 2001, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Thanks in advance. Regards, Balint -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: linking devices
Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. I believe the lvm package is supposed to do exactly what you're wanting. Check out: http://www.sistina.com/lvm/Pages/intro.html to find out. I've never used it, just know about it. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
linking devices
Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Thanks in advance. Regards, Balint
Re: linking devices
On Tue, Feb 13, 2001 at 11:02:06AM +, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Yes.. You should be able to use the 'md' driver/subsystem to create a big virtual drive across multiple drives. There is only one problem... a 70 Gig file won't fit... since there is a filesize limitation (I think 2GB) So you'd have to split up the file in 2GB parts anyway, and then it's useless to go the hard way with md or lvm Mark Janssen Unix Consultant @ SyConOS IT E-mail: [EMAIL PROTECTED]GnuPG Key Id: 357D2178 http: markjanssen.homeip.net and markjanssen.[com|net|org|nl] Fax/VoiceMail: +31 20 8757555 Finger for GPG and GeekCode pgp4dioj17VHf.pgp Description: PGP signature
Re: linking devices
You speak about Raid-0 - have a look at Software-RAID-HOWTO. The limitation of 2gb per file is not true anymore with the kernel 2.4 (as long as your libc6 has been compiled with the kernel 2.4 - the simplest is to work on a Woody :-) ) Or if you work on a 64bit architecture you can have bigger files : This mail went on this list a few weeks ago : thanks , I have installed kernel 2.4.1 with the latest util-linux ,modutils and raidtool (arrrgg) and finally I can write file 2Gb :-) ...now i must rebuild ls, mv etc. m. On Tue, Feb 06, 2001 at 09:33:06AM -0800 or thereabouts, brian moore wrote: On Tue, Feb 06, 2001 at 12:06:16AM -0500, Fraser Campbell wrote: Francis 'Dexter' Gois [EMAIL PROTECTED] writes: Not sure, but i think your problem is not with the NFS but with the ext2fs filesystem, which cannot handle files larger than 2gb. Yes, ext2's maximum file size is 1 byte less than 2 GB (2147483647 bytes. Bzzt. Wrong. This is a limit of 2.2 and earlier kernels on 32 bit hardware. It has -NOTHING- to do with the file system per se: you will see exactly the same situation on Reiserfs, NFS (exported from a 64 bit machine even!), and every other file system. Why? Try 'man lseek' and note that the size of off_t, which is a 32 bit number on 32 bit platforms. There are lots and lots of library and system calls that expect or return something of type off_t, which can not exceed 32 bits on a 32 bit machine without some hackery. (See google for the 'large filesystem summit' for how ugly that hackery is.) The exact same file systems -do- support huge files on 64 bit machines. Why? Again, off_t is a 64 bit number on a 64 bit machine. If the remote filesystem is ext2 then this is definitely the problem. The 2.4 kernel gets around this problem at least with some filesystems (perhaps still not with ext2 though) ... if you really need to create files 2GB then you should upgrade your kernel. I've been running woody with 2.4 kernels (test and stable) for months without any problems, YMMV. Doesn't matter -what- the remote file system type is. Neither NFS nor glibc supports large files on 2.2 kernels. Period. Not with e2fs, not with nfs, not with anything. If you need files =2G, you need a newer kernel or a 64 bit machine. On Tuesday 13 February 2001 11:06, Mark Janssen wrote: On Tue, Feb 13, 2001 at 11:02:06AM +, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Yes.. You should be able to use the 'md' driver/subsystem to create a big virtual drive across multiple drives. There is only one problem... a 70 Gig file won't fit... since there is a filesize limitation (I think 2GB) So you'd have to split up the file in 2GB parts anyway, and then it's useless to go the hard way with md or lvm Mark Janssen Unix Consultant @ SyConOS IT E-mail: [EMAIL PROTECTED]GnuPG Key Id: 357D2178 http: markjanssen.homeip.net and markjanssen.[com|net|org|nl] Fax/VoiceMail: +31 20 8757555 Finger for GPG and GeekCode Content-Type: application/pgp-signature; charset=us-ascii; name=Attachment: 1 Content-Transfer-Encoding: 7bit Content-Description: -- ++ +--+ -Got this blue screen- -- Keep the Internet FREE with Tiscalinet -- -once again -- -- Be GNU : have a Linux attitude :-) -- ++ +--+ - _+---+ Francis 'Dexter' Gois \-/ / \-/ / - Already tried to - Tiscali Belgium System Administrator (_°~ ~°_) -install GNU/Linux ?- mailto : [EMAIL PROTECTED] / \ / \ +---+ Phone +3224000920 - fax +3224000899
Re: linking devices
Mark Janssen wrote: On Tue, Feb 13, 2001 at 11:02:06AM +, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Yes.. You should be able to use the 'md' driver/subsystem to create a big virtual drive across multiple drives. There is only one problem... a 70 Gig file won't fit... since there is a filesize limitation (I think 2GB) So you'd have to split up the file in 2GB parts anyway, and then it's useless to go the hard way with md or lvm As mentioned before, the 2GB limit was removed in the 2.4 kernels. Also have a look at the LVM that is included in the 2.4 kernels. It should allow you to dynamically add disks to a virtual partition. Maarten Vink
Re: linking devices
Hi, try RAID systems. There are different forms, I belive RAID0, 1 and 5. One of them makes it able to link two disks. Greetz, Sebastiaan On Tue, 13 Feb 2001, Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. Thanks in advance. Regards, Balint -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: linking devices
Kozman Balint wrote: Hi, is there any way to link two (or more) block devices (ex: two hard disks) into one logical block device? I need this to be able to copy a file of 70Gb to a machine which has two disks of 40 Gb. I believe the lvm package is supposed to do exactly what you're wanting. Check out: http://www.sistina.com/lvm/Pages/intro.html to find out. I've never used it, just know about it.
